Numerical stimulation and experimental validation of stress in C/SiC riveting joints under tensile load
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摘要: 利用有限元模拟和实验验证研究了拉伸载荷下C/SiC铆接接头的应力分布及几何参数与破坏方式的固有关系。结果表明: 接头的锥度变化对接头中的应力分布影响不大, 但对应力值的影响较为明显, 锥度控制在2°～10°比较合适。模拟计算的铆钉临界半径为2.2016 mm, 小于2.2016 mm时, 铆钉被拉断, 反之, 铆钉被拔出。实验得到的临界半径为2.25 mm, 与计算结果的误差为2.2%, 说明提出的铆接接头几何结构参数与接头破坏形式关系的模型是正确的。Abstract: The stress concentration, inhere relationship between geometrical structure parameters and fracture forms in C/SiC riveting joints were investigated by FEM and experimental validation. The results show that the cone angle has little influence on the stress concentration, but it has important influence on stress value. The suitable cone angle range is 2°-10°. The critical radius of C/SiC rivet is 2.2016 mm by simulations. The rivet will break when the radius of C/SiC rivet is smaller than 2.2016 mm. Otherwise, the rivet will be pulled out of SiC. The critical radius of C/SiC rivet is 2.25 mm by experiment. The error between simulation result and experimental result is 2.2%, which validates the established FEM models for analyzing the stress concentration and fracture forms and the stimulation results.
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Key words:
- C/SiC /
- riveting joints /
- tensile load /
- stress /
- numerical simulation /
- experimental validation
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